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Message-ID: <CADZsf3YviRWf=6gDKVLpMkttVU42K7-+=J-O-oPQZ3BGhV4rdw@mail.gmail.com>
Date: Sun, 27 Sep 2020 18:09:24 +0200
From: Luka Kovacic <luka.kovacic@...tura.hr>
To: Marek Behun <marek.behun@....cz>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-hwmon@...r.kernel.org,
linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
Linux LED Subsystem <linux-leds@...r.kernel.org>,
Lee Jones <lee.jones@...aro.org>, Pavel Machek <pavel@....cz>,
Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Andrew Lunn <andrew@...n.ch>,
Jason Cooper <jason@...edaemon.net>,
Gregory Clement <gregory.clement@...tlin.com>,
Luka Perkov <luka.perkov@...tura.hr>,
Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH v2 2/7] drivers: mfd: Add a driver for iEi WT61P803 PUZZLE MCU
Hi Marek,
Thanks for going through the patch.
Ok, the MAC addresses and the serial number always have the same length, so
I'll use a fixed array.
I can also apply the reverse christmas tree ordering to all three
drivers, I agree it
looks better.
Kind regards,
Luka
On Sat, Sep 26, 2020 at 9:28 PM Marek Behun <marek.behun@....cz> wrote:
>
> On Sat, 26 Sep 2020 15:55:09 +0200
> Luka Kovacic <luka.kovacic@...tura.hr> wrote:
>
> > Add a driver for the iEi WT61P803 PUZZLE microcontroller, used in some
> > iEi Puzzle series devices. The microcontroller controls system power,
> > temperature sensors, fans and LEDs.
> >
> > This driver implements the core functionality for device communication
> > over the system serial (serdev bus). It handles MCU messages and the
> > internal MCU properties. Some properties can be managed over sysfs.
> >
>
> Hi Luka,
>
> this patch produces some checkpatch warnings, some of them are
> reasonable.
>
> My thought below:
>
> > Signed-off-by: Luka Kovacic <luka.kovacic@...tura.hr>
> > Cc: Luka Perkov <luka.perkov@...tura.hr>
> > Cc: Robert Marko <robert.marko@...tura.hr>
> > ---
> > drivers/mfd/Kconfig | 8 +
> > drivers/mfd/Makefile | 1 +
> > drivers/mfd/iei-wt61p803-puzzle.c | 1069 +++++++++++++++++++++++
> > include/linux/mfd/iei-wt61p803-puzzle.h | 69 ++
> > 4 files changed, 1147 insertions(+)
> > create mode 100644 drivers/mfd/iei-wt61p803-puzzle.c
> > create mode 100644 include/linux/mfd/iei-wt61p803-puzzle.h
> >
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 33df0837ab41..b1588845894e 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -2118,5 +2118,13 @@ config SGI_MFD_IOC3
> > If you have an SGI Origin, Octane, or a PCI IOC3 card,
> > then say Y. Otherwise say N.
> >
> > +config MFD_IEI_WT61P803_PUZZLE
> > + tristate "iEi WT61P803 PUZZLE MCU driver"
> > + depends on SERIAL_DEV_BUS
> > + help
> > + iEi WT61P803 PUZZLE is a system power management microcontroller
> > + used for fan control, temperature sensor reading, LED control
> > + and system identification.
> > +
> > endmenu
> > endif
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index a60e5f835283..33b88023a68d 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -236,6 +236,7 @@ obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o
> > obj-$(CONFIG_MFD_DLN2) += dln2.o
> > obj-$(CONFIG_MFD_RT5033) += rt5033.o
> > obj-$(CONFIG_MFD_SKY81452) += sky81452.o
> > +obj-$(CONFIG_MFD_IEI_WT61P803_PUZZLE) += iei-wt61p803-puzzle.o
> >
> > intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
> > obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
> > diff --git a/drivers/mfd/iei-wt61p803-puzzle.c b/drivers/mfd/iei-wt61p803-puzzle.c
> > new file mode 100644
> > index 000000000000..5cba010ac9b9
> > --- /dev/null
> > +++ b/drivers/mfd/iei-wt61p803-puzzle.c
> > @@ -0,0 +1,1069 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/* iEi WT61P803 PUZZLE MCU Driver
> > + * System management microcontroller for fan control, temperature sensor reading,
> > + * LED control and system identification on iEi Puzzle series ARM-based appliances.
> > + *
> > + * Copyright (C) 2020 Sartura Ltd.
> > + * Author: Luka Kovacic <luka.kovacic@...tura.hr>
> > + */
> > +
> > +#include <asm/unaligned.h>
> > +#include <linux/atomic.h>
> > +#include <linux/delay.h>
> > +#include <linux/delay.h>
> > +#include <linux/export.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/iei-wt61p803-puzzle.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/property.h>
> > +#include <linux/sched.h>
> > +#include <linux/serdev.h>
> > +#include <linux/slab.h>
> > +#include <linux/sysfs.h>
> > +
> > +#define IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH (20 + 2)
> > +#define IEI_WT61P803_PUZZLE_RESP_BUF_SIZE 512
> > +
> > +/* Use HZ as a timeout value throughout the driver */
> > +#define IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT HZ
> > +
> > +/**
> > + * struct iei_wt61p803_puzzle_mcu_status - MCU flags state
> > + *
> > + * @ac_recovery_status_flag: AC Recovery Status Flag
> > + * @power_loss_recovery: System recovery after power loss
> > + * @power_status: System Power-on Method
> > + */
> > +struct iei_wt61p803_puzzle_mcu_status {
> > + u8 ac_recovery_status_flag;
> > + u8 power_loss_recovery;
> > + u8 power_status;
> > +};
> > +
> > +/**
> > + * enum iei_wt61p803_puzzle_reply_state - State of the reply
> > + * @FRAME_OK: The frame was completely processed/received
> > + * @FRAME_PROCESSING: First bytes were received, but the frame isn't complete
> > + * @FRAME_STRUCT_EMPTY: The frame struct is empty, no data was received
> > + * @FRAME_TIMEOUT: The frame processing timed out, communication failed
> > + *
> > + * Describes the general state of the frame that is currently being received.
> > + */
> > +enum iei_wt61p803_puzzle_reply_state {
> > + FRAME_OK = 0x00,
> > + FRAME_PROCESSING = 0x01,
> > + FRAME_STRUCT_EMPTY = 0xFF,
> > + FRAME_TIMEOUT = 0xFE
> > +};
> > +
> > +/**
> > + * struct iei_wt61p803_puzzle_reply - MCU reply
> > + *
> > + * @size: Size of the MCU reply
> > + * @data: Full MCU reply buffer
> > + * @state: Current state of the packet
> > + * @received: Was the response fullfilled
> > + */
> > +struct iei_wt61p803_puzzle_reply {
> > + size_t size;
> > + unsigned char *data;
> > + u8 state;
> > + struct completion received;
> > +};
> > +
> > +/**
> > + * struct iei_wt61p803_puzzle_mcu_version - MCU version status
> > + *
> > + * @version: Primary firmware version
> > + * @build_info: Build date and time
> > + * @bootloader_mode: Status of the MCU operation
> > + * @protocol_version: MCU communication protocol version
> > + * @serial_number: Device factory serial number
> > + * @mac_address: Device factory MAC addresses
> > + */
> > +struct iei_wt61p803_puzzle_mcu_version {
> > + const char *version;
> > + const char *build_info;
> > + bool bootloader_mode;
> > + const char *protocol_version;
> > + const char *serial_number;
> > + const char *mac_address[8];
>
> You use devm_kasprintf below for these, but such variables have limited
> and often small length. The mac_address array could for example be:
> char mac_address[8][18];
> Can serial number be longer than 32 bytes? What about the other members?
> I believe it would be better, to avoid unnecesarry allocations, to
> change this.
>
> > +};
> > +
> > +/**
> > + * struct iei_wt61p803_puzzle - iEi WT61P803 PUZZLE MCU Driver
> > + *
> > + * @serdev: Pointer to underlying serdev device
> > + * @kobj: Pointer to kobject (sysfs)
> > + * @reply_lock: Reply mutex lock
> > + * @bus_lock: Bus mutex lock
> > + * @reply: Pointer to the iei_wt61p803_puzzle_reply struct
> > + * @version: MCU version related data
> > + * @status: MCU status related data
> > + * @response_buffer Command response buffer allocation
> > + * @lock General member mutex lock
> > + */
> > +struct iei_wt61p803_puzzle {
> > + struct serdev_device *serdev;
> > + struct kobject *kobj;
> > + struct mutex reply_lock;
> > + struct mutex bus_lock;
> > + struct iei_wt61p803_puzzle_reply *reply;
> > + struct iei_wt61p803_puzzle_mcu_version version;
> > + struct iei_wt61p803_puzzle_mcu_status status;
> > + unsigned char *response_buffer;
> > + struct mutex lock;
> > +};
> > +
> > +unsigned char iei_wt61p803_puzzle_checksum(unsigned char *buf, size_t len)
> > +{
> > + unsigned char checksum = 0;
> > + unsigned int i;
> > +
> > + for (i = 0; i < len; i++)
> > + checksum ^= buf[i];
> > +
> > + return checksum;
> > +}
>
> This function should be static.
> And maybe for the whole driver: s/unsigned char/u8/
>
> > +
> > +static int iei_wt61p803_puzzle_process_resp(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char *raw_resp_data, size_t size)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > +
> > + unsigned char checksum;
>
> Empty line between declarations?
>
> > +
> > + mutex_lock(&mcu->reply_lock);
> > +
> > + /* Check the incoming frame header */
> > + if (!(raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START ||
> > + raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER ||
> > + (raw_resp_data[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM &&
> > + raw_resp_data[1] == IEI_WT61P803_PUZZLE_CMD_EEPROM_READ))) {
> > +
> > + /* Frame header is not correct, check whether to append */
> > + if (mcu->reply->state != FRAME_PROCESSING) {
> > + dev_err(dev, "Invalid frame header and state (0x%x)", mcu->reply->state);
> > + mutex_unlock(&mcu->reply_lock);
> > + return -EIO;
> > + }
> > +
> > + /* Append the frame to existing data */
> > + memcpy(mcu->reply->data+mcu->reply->size, raw_resp_data, size);
> > + mcu->reply->size += size;
> > + } else {
> > + /* Start processing a new frame */
> > + memcpy(mcu->reply->data, raw_resp_data, size);
> > + mcu->reply->size = size;
> > + mcu->reply->state = FRAME_PROCESSING;
> > + }
> > +
> > + checksum = iei_wt61p803_puzzle_checksum(mcu->reply->data, mcu->reply->size-1);
> > +
> > + if (checksum != mcu->reply->data[mcu->reply->size-1]) {
> > + /* The checksum isn't matched yet, wait for new frames */
> > + mutex_unlock(&mcu->reply_lock);
> > + return (int)size;
> > + }
> > +
> > + /* Received all the data */
> > + mcu->reply->state = FRAME_OK;
> > + complete(&mcu->reply->received);
> > +
> > + mutex_unlock(&mcu->reply_lock);
> > +
> > + return (int)size;
> > +}
> > +
> > +static int iei_wt61p803_puzzle_recv_buf(struct serdev_device *serdev,
> > + const unsigned char *data, size_t size)
> > +{
> > + struct iei_wt61p803_puzzle *mcu = serdev_device_get_drvdata(serdev);
> > + int ret;
> > +
> > + ret = iei_wt61p803_puzzle_process_resp(mcu, (unsigned char *)data, size);
> > +
> > + /* Return the number of processed bytes if function returns error */
> > + if (ret < 0)
> > + return (int)size;
> > +
> > + return ret;
> > +}
> > +
> > +static const struct serdev_device_ops iei_wt61p803_puzzle_serdev_device_ops = {
> > + .receive_buf = iei_wt61p803_puzzle_recv_buf,
> > + .write_wakeup = serdev_device_write_wakeup,
> > +};
> > +
> > +/**
> > + * iei_wt61p803_puzzle_write_command_watchdog() - Watchdog of the normal cmd
> > + * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
> > + * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
> > + * @size: Size of the cmd char array
> > + * @reply_data: Pointer to the reply/response data array (should be allocated)
> > + * @reply_size: Pointer to size_t (size of reply_data)
> > + * @retry_count: Number of times to retry sending the command to the MCU
> > + */
> > +int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char *cmd, size_t size, unsigned char *reply_data,
> > + size_t *reply_size, int retry_count)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + int ret, i;
> > +
> > + for (i = 0; i < retry_count; i++) {
> > + ret = iei_wt61p803_puzzle_write_command(mcu, cmd, size,
> > + reply_data, reply_size);
> > +
> > + if (ret != -ETIMEDOUT)
> > + return ret;
> > + }
> > +
> > + dev_err(dev, "%s: Command response timed out. Retries: %d", __func__,
> > + retry_count);
>
> The indentation here is weird, I would put the retry_count at the
> position one to the right after dev_err(. But this is not important.
>
> > +
> > + return -ETIMEDOUT;
> > +}
> > +EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command_watchdog);
> > +
> > +/**
> > + * iei_wt61p803_puzzle_write_command() - Send a structured command to the MCU
> > + * @mcu: Pointer to the iei_wt61p803_puzzle core MFD struct
> > + * @cmd: Pointer to the char array to send (size should be content + 1 (xor))
> > + * @size: Size of the cmd char array
> > + * @reply_data: Pointer to the reply/response data array (should be allocated)
> > + *
> > + * Sends a structured command to the MCU.
> > + */
> > +int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char *cmd, size_t size, unsigned char *reply_data,
> > + size_t *reply_size)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + int ret;
> > + int len = (int)size;
>
> Some kernel maintainers like reverse christmas tree order of variable
> declaration. I find it better to read. If you would like to try:
> struct device *dev = &mcu->serdev->dev;
> int len = (int)size;
> int ret;
>
> > +
> > + if (size > IEI_WT61P803_PUZZLE_MAX_COMMAND_LENGTH)
> > + return -EINVAL;
> > +
> > + cmd[len - 1] = iei_wt61p803_puzzle_checksum(cmd, size);
> > +
> > + mutex_lock(&mcu->bus_lock);
> > + mutex_lock(&mcu->reply_lock);
> > +
> > + if (!mcu->reply) {
> > + ret = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + /* Initialize reply struct */
> > + reinit_completion(&mcu->reply->received);
> > + mcu->reply->state = FRAME_STRUCT_EMPTY;
> > + mcu->reply->size = 0;
> > + mutex_unlock(&mcu->reply_lock);
> > +
> > + ret = serdev_device_write(mcu->serdev, cmd, len, IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT);
> > +
> > + if (ret < 0) {
> > + mutex_unlock(&mcu->bus_lock);
> > + return ret;
> > + }
> > +
> > + if (!wait_for_completion_timeout(&mcu->reply->received,
> > + IEI_WT61P803_PUZZLE_GENERAL_TIMEOUT)) {
> > + dev_err(dev, "Command reply receive timeout\n");
> > + mutex_lock(&mcu->reply_lock);
> > + reinit_completion(&mcu->reply->received);
> > + mcu->reply->state = FRAME_TIMEOUT;
> > +
> > + ret = -ETIMEDOUT;
> > + goto exit;
> > + }
> > +
> > + mutex_lock(&mcu->reply_lock);
> > +
> > + if (!mcu->reply) {
> > + ret = -EFAULT;
> > + goto exit;
> > + }
> > +
> > + *reply_size = mcu->reply->size;
> > + /* Copy the received data, as it will not be available after a new frame is received */
> > + memcpy(reply_data, mcu->reply->data, mcu->reply->size);
> > +
> > + ret = 0;
> > +exit:
> > + mutex_unlock(&mcu->reply_lock);
> > + mutex_unlock(&mcu->bus_lock);
> > + return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(iei_wt61p803_puzzle_write_command);
> > +
> > +int iei_wt61p803_puzzle_buzzer(struct iei_wt61p803_puzzle *mcu, bool long_beep)
> > +{
> > + unsigned char buzzer_short_cmd[4] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
> > + '2'
> > + }; /* Buzzer 0.5 sec */
> > + unsigned char buzzer_long_cmd[4] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE,
> > + '3'
> > + }; /* Buzzer 1.5 sec */
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = iei_wt61p803_puzzle_write_command(mcu,
> > + long_beep ? buzzer_long_cmd : buzzer_short_cmd, 4,
> > + resp_buf, &reply_size);
> > + if (ret)
> > + goto exit;
> > +
> > + if (reply_size != 3) {
> > + ret = -EIO;
> > + goto exit;
> > + }
> > +
> > + if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> > + resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
> > + resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
>
> Again weird indentation here, I would do
>
> if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
> resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
>
>
> > + ret = -EPROTO;
> > + goto exit;
> > + }
> > +exit:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_get_version(struct iei_wt61p803_puzzle *mcu)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + unsigned char version_cmd[3] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION
> > + };
> > + unsigned char build_info_cmd[3] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD
> > + };
> > + unsigned char bootloader_mode_cmd[3] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE
> > + };
> > + unsigned char protocol_version_cmd[3] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION
> > + };
> > + unsigned char *rb = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, version_cmd,
> > + sizeof(version_cmd), rb, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size < 7) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + mcu->version.version = devm_kasprintf(dev, GFP_KERNEL, "v%c.%c%c%c",
> > + rb[2], rb[3], rb[4], rb[5]);
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, build_info_cmd,
> > + sizeof(build_info_cmd), rb, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size < 15) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + mcu->version.build_info = devm_kasprintf(dev, GFP_KERNEL,
> > + "%c%c/%c%c/%c%c%c%c %c%c:%c%c",
> > + rb[8], rb[9], rb[6], rb[7], rb[2],
> > + rb[3], rb[4], rb[5], rb[10], rb[11],
> > + rb[12], rb[13]);
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, bootloader_mode_cmd,
> > + sizeof(bootloader_mode_cmd), rb, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size < 4) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS)
> > + mcu->version.bootloader_mode = false;
> > + else if (rb[2] == IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER)
> > + mcu->version.bootloader_mode = true;
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, protocol_version_cmd,
> > + sizeof(protocol_version_cmd), rb, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size < 9) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + mcu->version.protocol_version = devm_kasprintf(dev, GFP_KERNEL,
> > + "v%c.%c%c%c%c%c",
> > + rb[7], rb[6], rb[5], rb[4], rb[3], rb[2]);
> > +err:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_get_mcu_status(struct iei_wt61p803_puzzle *mcu)
> > +{
> > + unsigned char mcu_status_cmd[5] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS
> > + };
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = iei_wt61p803_puzzle_write_command(mcu, mcu_status_cmd,
> > + sizeof(mcu_status_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + goto exit;
> > + if (reply_size < 20) {
> > + ret = -EIO;
> > + goto exit;
> > + }
> > +
> > + /* Response format:
> > + * (IDX RESPONSE)
> > + * 0 @
> > + * 1 O
> > + * 2 S
> > + * 3 S
> > + * ...
> > + * 5 AC Recovery Status Flag
> > + * ...
> > + * 10 Power Loss Recovery
> > + * ...
> > + * 19 Power Status (system power on method)
> > + * 20 XOR checksum
> > + */
> > + if (resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> > + resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER &&
> > + resp_buf[2] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS &&
> > + resp_buf[3] == IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS) {
> > + mcu->status.ac_recovery_status_flag = resp_buf[5];
> > + mcu->status.power_loss_recovery = resp_buf[10];
> > + mcu->status.power_status = resp_buf[19];
> > + }
> > +exit:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_get_serial_number(struct iei_wt61p803_puzzle *mcu)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + unsigned char serial_number_cmd[5] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
> > + IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
> > + 0x00,
> > + 0x24
> > + };
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
> > + sizeof(serial_number_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + goto err;
> > +
> > + mcu->version.serial_number = devm_kasprintf(dev, GFP_KERNEL, "%.*s",
> > + (int)reply_size - 5, resp_buf + 4);
> > +err:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +
> > +}
> > +
> > +int iei_wt61p803_puzzle_write_serial_number(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char serial_number[36])
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + unsigned char serial_number_header[4] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
> > + IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
> > + 0x00,
> > + 0xC
> > + };
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + unsigned char serial_number_cmd[4+12+1]; /* header, serial number chunk, XOR checksum */
> > + int ret, sn_counter;
> > + size_t reply_size = 0;
> > +
> > + /* The MCU can only handle 22 byte messages, send the S/N in chunks */
> > + mutex_lock(&mcu->lock);
> > + for (sn_counter = 0; sn_counter < 3; sn_counter++) {
> > + serial_number_header[2] = 0x0 + (0xC) * sn_counter;
> > +
> > + memcpy(serial_number_cmd, serial_number_header, 4);
> > + memcpy(serial_number_cmd + 4, serial_number + (0xC) * sn_counter, 0xC);
> > +
> > + serial_number_cmd[sizeof(serial_number_cmd) - 1] = 0;
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, serial_number_cmd,
> > + sizeof(serial_number_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size != 3) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> > + resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
> > + resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
> > + ret = -EPROTO;
> > + goto err;
> > + }
> > + }
> > +
> > + mcu->version.serial_number = devm_kasprintf(dev, GFP_KERNEL, "%.*s",
> > + 36, serial_number);
> > +err:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_get_mac_addresses(struct iei_wt61p803_puzzle *mcu)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + unsigned char mac_address_cmd[5] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
> > + IEI_WT61P803_PUZZLE_CMD_EEPROM_READ,
> > + 0x00,
> > + 0x11
> > + };
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + int ret, mac_counter;
> > + size_t reply_size = 0;
> > +
> > + mutex_lock(&mcu->lock);
> > + for (mac_counter = 0; mac_counter < 8; mac_counter++) {
> > + mac_address_cmd[2] = 0x24 + (0x11) * mac_counter;
> > + mac_address_cmd[4] = 0x00;
> > +
> > + ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
> > + sizeof(mac_address_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + continue;
> > +
> > + if (reply_size < 22) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > +
> > + mcu->version.mac_address[mac_counter] = devm_kasprintf(dev,
> > + GFP_KERNEL, "%.*s", (int)reply_size - 5,
> > + resp_buf + 4);
> > + }
> > +err:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_write_mac_address(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char mac_address[17], int mac_address_idx)
> > +{
> > + struct device *dev = &mcu->serdev->dev;
> > + unsigned char mac_address_header[4] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM,
> > + IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE,
> > + 0x00,
> > + 0x11
> > + };
> > + unsigned char mac_address_cmd[4+17+1]; /* header, MAC address, XOR checksum*/
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + int ret;
> > +
> > + if (!(mac_address_idx < 8))
> > + return -EINVAL;
> > +
> > + mac_address_header[2] = 0x24 + (0x11) * mac_address_idx;
> > +
> > + /* Concat mac_address_header, mac_address to mac_address_cmd */
> > + memcpy(mac_address_cmd, mac_address_header, 4);
> > + memcpy(mac_address_cmd + 4, mac_address, 17);
> > +
> > + mac_address_cmd[sizeof(mac_address_cmd) - 1] = 0;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = iei_wt61p803_puzzle_write_command(mcu, mac_address_cmd,
> > + sizeof(mac_address_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + goto err;
> > + if (reply_size != 3) {
> > + ret = -EIO;
> > + goto err;
> > + }
> > + if (!(resp_buf[0] == IEI_WT61P803_PUZZLE_CMD_HEADER_START &&
> > + resp_buf[1] == IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK &&
> > + resp_buf[2] == IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK)) {
> > + ret = -EPROTO;
> > + goto err;
> > + }
> > +
> > + mcu->version.mac_address[mac_address_idx] = devm_kasprintf(dev,
> > + GFP_KERNEL, "%.*s", 17, mac_address);
> > +err:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +int iei_wt61p803_puzzle_write_power_loss_recovery(struct iei_wt61p803_puzzle *mcu,
> > + int power_loss_recovery_action)
> > +{
> > + unsigned char power_loss_recovery_cmd[5] = {
> > + IEI_WT61P803_PUZZLE_CMD_HEADER_START,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER,
> > + IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS,
> > + '0'
> > + };
> > + unsigned char *resp_buf = mcu->response_buffer;
> > + size_t reply_size = 0;
> > + unsigned char cmd_buf[2];
> > + int ret;
> > +
> > + if (power_loss_recovery_action < 0 || power_loss_recovery_action > 4)
> > + return -EINVAL;
> > +
> > + ret = snprintf(cmd_buf, sizeof(cmd_buf), "%d", power_loss_recovery_action);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* Modify the command with the action index */
> > + power_loss_recovery_cmd[3] = cmd_buf[0];
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = iei_wt61p803_puzzle_write_command(mcu, power_loss_recovery_cmd,
> > + sizeof(power_loss_recovery_cmd), resp_buf, &reply_size);
> > + if (ret)
> > + goto exit;
> > + mcu->status.power_loss_recovery = power_loss_recovery_action;
> > +exit:
> > + mutex_unlock(&mcu->lock);
> > + return ret;
> > +}
> > +
> > +#define sysfs_container(dev) \
> > + (container_of((dev)->kobj.parent, struct device, kobj))
> > +
> > +static ssize_t version_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + return sprintf(buf, "%s\n", mcu->version.version);
> > +}
> > +static DEVICE_ATTR_RO(version);
> > +
> > +static ssize_t build_info_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + return sprintf(buf, "%s\n", mcu->version.build_info);
> > +}
> > +static DEVICE_ATTR_RO(build_info);
> > +
> > +static ssize_t bootloader_mode_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + return sprintf(buf, "%d\n", mcu->version.bootloader_mode);
> > +}
> > +static DEVICE_ATTR_RO(bootloader_mode);
> > +
> > +static ssize_t protocol_version_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + return sprintf(buf, "%s\n", mcu->version.protocol_version);
> > +}
> > +static DEVICE_ATTR_RO(protocol_version);
> > +
> > +static ssize_t serial_number_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = sprintf(buf, "%s\n", mcu->version.serial_number);
> > + mutex_unlock(&mcu->lock);
> > +
> > + return ret;
> > +}
> > +static ssize_t serial_number_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > + unsigned char serial_number[36];
> > + int ret;
> > +
> > + /* Check whether the serial number is 36 characters long + null */
> > + if ((int)count != 36 + 1)
> > + return -EINVAL;
> > +
> > + /* Copy 36 characters from the buffer to serial_number */
> > + memcpy(serial_number, (unsigned char *)buf, 36);
> > +
> > + ret = iei_wt61p803_puzzle_write_serial_number(mcu, serial_number);
> > + if (ret)
> > + return ret;
> > +
> > + return count;
> > +}
> > +static DEVICE_ATTR_RW(serial_number);
> > +
> > +static ssize_t mac_address_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > + int ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + if (!strcmp(attr->attr.name, "mac_address_0"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[0]);
> > + else if (!strcmp(attr->attr.name, "mac_address_1"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[1]);
> > + else if (!strcmp(attr->attr.name, "mac_address_2"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[2]);
> > + else if (!strcmp(attr->attr.name, "mac_address_3"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[3]);
> > + else if (!strcmp(attr->attr.name, "mac_address_4"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[4]);
> > + else if (!strcmp(attr->attr.name, "mac_address_5"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[5]);
> > + else if (!strcmp(attr->attr.name, "mac_address_6"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[6]);
> > + else if (!strcmp(attr->attr.name, "mac_address_7"))
> > + ret = sprintf(buf, "%s\n", mcu->version.mac_address[7]);
> > + else
> > + ret = sprintf(buf, "\n");
>
> WHYYYYY?
>
> int idx;
>
> if (strlen(attr->attr.name) != 13)
> return -EIO;
>
> idx = attr->attr.name[12] - '0';
> if (idx < 0 || idx > 7)
> return -EIO;
> ret = sprintf(buf, "%s\n", mcu->version.mac_address[idx]);
>
> > + mutex_unlock(&mcu->lock);
> > +
> > + return ret;
> > +}
> > +static ssize_t mac_address_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > + unsigned char mac_address[17];
> > + int ret;
> > +
> > + if ((int)count != 17 + 1)
> > + return -EINVAL;
> > +
> > + memcpy(mac_address, (unsigned char *)buf, 17);
> > +
> > + if (!strcmp(attr->attr.name, "mac_address_0"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 0);
> > + else if (!strcmp(attr->attr.name, "mac_address_1"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 1);
> > + else if (!strcmp(attr->attr.name, "mac_address_2"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 2);
> > + else if (!strcmp(attr->attr.name, "mac_address_3"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 3);
> > + else if (!strcmp(attr->attr.name, "mac_address_4"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 4);
> > + else if (!strcmp(attr->attr.name, "mac_address_5"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 5);
> > + else if (!strcmp(attr->attr.name, "mac_address_6"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 6);
> > + else if (!strcmp(attr->attr.name, "mac_address_7"))
> > + ret = iei_wt61p803_puzzle_write_mac_address(mcu, mac_address, 7);
> > + if (ret)
> > + return ret;
> > +
>
> Similar to above.
>
> > + return count;
> > +}
> > +static DEVICE_ATTR(mac_address_0, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_1, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_2, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_3, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_4, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_5, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_6, 0644, mac_address_show, mac_address_store);
> > +static DEVICE_ATTR(mac_address_7, 0644, mac_address_show, mac_address_store);
> > +
> > +static ssize_t ac_recovery_status_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + int ret;
> > +
> > + ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = sprintf(buf, "%x\n", mcu->status.ac_recovery_status_flag);
> > + mutex_unlock(&mcu->lock);
> > +
> > + return ret;
> > +}
> > +static DEVICE_ATTR_RO(ac_recovery_status);
> > +
> > +static ssize_t power_loss_recovery_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + int ret;
> > +
> > + ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = sprintf(buf, "%x\n", mcu->status.power_loss_recovery);
> > + mutex_unlock(&mcu->lock);
> > +
> > + return ret;
> > +}
> > +static ssize_t power_loss_recovery_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + int ret;
> > + long power_loss_recovery_action = 0;
> > +
> > + ret = kstrtol(buf, 10, &power_loss_recovery_action);
> > + if (ret)
> > + return ret;
> > +
> > + ret = iei_wt61p803_puzzle_write_power_loss_recovery(mcu,
> > + (int)power_loss_recovery_action);
> > + if (ret)
> > + return ret;
> > +
> > + return count;
> > +}
> > +static DEVICE_ATTR_RW(power_loss_recovery);
> > +
> > +static ssize_t power_status_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct device *dev_container = sysfs_container(dev);
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev_container);
> > +
> > + int ret;
> > +
> > + ret = iei_wt61p803_puzzle_get_mcu_status(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + mutex_lock(&mcu->lock);
> > + ret = sprintf(buf, "%x\n", mcu->status.power_status);
> > + mutex_unlock(&mcu->lock);
> > +
> > + return ret;
> > +}
> > +static DEVICE_ATTR_RO(power_status);
> > +
> > +static struct attribute *iei_wt61p803_puzzle_attrs[] = {
> > + &dev_attr_version.attr,
> > + &dev_attr_build_info.attr,
> > + &dev_attr_bootloader_mode.attr,
> > + &dev_attr_protocol_version.attr,
> > + &dev_attr_serial_number.attr,
> > + &dev_attr_mac_address_0.attr,
> > + &dev_attr_mac_address_1.attr,
> > + &dev_attr_mac_address_2.attr,
> > + &dev_attr_mac_address_3.attr,
> > + &dev_attr_mac_address_4.attr,
> > + &dev_attr_mac_address_5.attr,
> > + &dev_attr_mac_address_6.attr,
> > + &dev_attr_mac_address_7.attr,
> > + &dev_attr_ac_recovery_status.attr,
> > + &dev_attr_power_loss_recovery.attr,
> > + &dev_attr_power_status.attr,
> > + NULL
> > +};
> > +ATTRIBUTE_GROUPS(iei_wt61p803_puzzle);
> > +
> > +static int iei_wt61p803_puzzle_sysfs_create(struct device *dev,
> > + struct iei_wt61p803_puzzle *mcu)
> > +{
> > + int ret;
> > +
> > + mcu->kobj = kobject_create_and_add("iei_wt61p803_puzzle_core", &dev->kobj);
> > + if (!mcu->kobj)
> > + return -ENOMEM;
> > +
> > + ret = sysfs_create_groups(mcu->kobj, iei_wt61p803_puzzle_groups);
> > + if (ret) {
> > + kobject_del(mcu->kobj);
> > + kobject_put(mcu->kobj);
> > + mcu->kobj = NULL;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int iei_wt61p803_puzzle_sysfs_remove(struct device *dev,
> > + struct iei_wt61p803_puzzle *mcu)
> > +{
> > + /* Remove sysfs groups */
> > + sysfs_remove_groups(mcu->kobj, iei_wt61p803_puzzle_groups);
> > +
> > + /* Remove the kobject */
> > + kobject_del(mcu->kobj);
> > + kobject_put(mcu->kobj);
> > + mcu->kobj = NULL;
> > +
> > + return 0;
> > +}
> > +
> > +static int iei_wt61p803_puzzle_probe(struct serdev_device *serdev)
> > +{
> > + struct device *dev = &serdev->dev;
> > + struct iei_wt61p803_puzzle *mcu;
> > + u32 baud;
> > + int ret;
> > +
> > + /* Read the baud rate from 'current-speed', because the MCU supports different rates */
> > + if (device_property_read_u32(dev, "current-speed", &baud)) {
> > + dev_err(dev,
> > + "'current-speed' is not specified in device node\n");
> > + return -EINVAL;
> > + }
> > + dev_info(dev, "Driver baud rate: %d", baud);
> > +
> > + /* Allocate the memory */
> > + mcu = devm_kzalloc(dev, sizeof(*mcu), GFP_KERNEL);
> > + if (!mcu)
> > + return -ENOMEM;
> > +
> > + mcu->reply = devm_kzalloc(dev, sizeof(*mcu->reply), GFP_KERNEL);
> > + if (!mcu->reply)
> > + return -ENOMEM;
> > +
> > + mcu->reply->data = devm_kzalloc(dev, IEI_WT61P803_PUZZLE_RESP_BUF_SIZE,
> > + GFP_KERNEL);
> > + if (!mcu->reply->data)
> > + return -ENOMEM;
> > +
> > + mcu->response_buffer = devm_kzalloc(dev, IEI_WT61P803_PUZZLE_BUF_SIZE,
> > + GFP_KERNEL);
> > + if (!mcu->response_buffer)
> > + return -ENOMEM;
> > +
> > + /* Initialize device struct data */
> > + mcu->serdev = serdev;
> > + init_completion(&mcu->reply->received);
> > + mutex_init(&mcu->reply_lock);
> > + mutex_init(&mcu->bus_lock);
> > + mutex_init(&mcu->lock);
> > +
> > + /* Setup UART interface */
> > + serdev_device_set_drvdata(serdev, mcu);
> > + serdev_device_set_client_ops(serdev, &iei_wt61p803_puzzle_serdev_device_ops);
> > + ret = devm_serdev_device_open(dev, serdev);
> > + if (ret)
> > + return ret;
> > + serdev_device_set_baudrate(serdev, baud);
> > + serdev_device_set_flow_control(serdev, false);
> > + ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
> > + if (ret) {
> > + dev_err(dev, "Failed to set parity");
> > + return ret;
> > + }
> > +
> > + ret = iei_wt61p803_puzzle_get_version(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + ret = iei_wt61p803_puzzle_get_mac_addresses(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + ret = iei_wt61p803_puzzle_get_serial_number(mcu);
> > + if (ret)
> > + return ret;
> > +
> > + dev_info(dev, "MCU version: %s", mcu->version.version);
> > + dev_info(dev, "MCU firmware build info: %s", mcu->version.build_info);
> > + dev_info(dev, "MCU in bootloader mode: %s",
> > + mcu->version.bootloader_mode ? "true" : "false");
> > + dev_info(dev, "MCU protocol version: %s", mcu->version.protocol_version);
> > +
> > + if (device_property_read_bool(dev, "enable-beep")) {
> > + ret = iei_wt61p803_puzzle_buzzer(mcu, false);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = iei_wt61p803_puzzle_sysfs_create(dev, mcu);
> > +
> > + return devm_of_platform_populate(dev);
> > +}
> > +
> > +static void iei_wt61p803_puzzle_remove(struct serdev_device *serdev)
> > +{
> > + struct device *dev = &serdev->dev;
> > + struct iei_wt61p803_puzzle *mcu = dev_get_drvdata(dev);
> > +
> > + iei_wt61p803_puzzle_sysfs_remove(dev, mcu);
> > +}
> > +
> > +static const struct of_device_id iei_wt61p803_puzzle_dt_ids[] = {
> > + { .compatible = "iei,wt61p803-puzzle" },
> > + { }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, iei_wt61p803_puzzle_dt_ids);
> > +
> > +static struct serdev_device_driver iei_wt61p803_puzzle_drv = {
> > + .probe = iei_wt61p803_puzzle_probe,
> > + .remove = iei_wt61p803_puzzle_remove,
> > + .driver = {
> > + .name = "iei-wt61p803-puzzle",
> > + .of_match_table = iei_wt61p803_puzzle_dt_ids,
> > + },
> > +};
> > +
> > +module_serdev_device_driver(iei_wt61p803_puzzle_drv);
> > +
> > +MODULE_LICENSE("GPL");
> > +MODULE_AUTHOR("Luka Kovacic <luka.kovacic@...tura.hr>");
> > +MODULE_DESCRIPTION("iEi WT61P803 PUZZLE MCU Driver");
> > diff --git a/include/linux/mfd/iei-wt61p803-puzzle.h b/include/linux/mfd/iei-wt61p803-puzzle.h
> > new file mode 100644
> > index 000000000000..633ceb1d00e3
> > --- /dev/null
> > +++ b/include/linux/mfd/iei-wt61p803-puzzle.h
> > @@ -0,0 +1,69 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/* iEi WT61P803 PUZZLE MCU Driver
> > + * System management microcontroller for fan control, temperature sensor reading,
> > + * LED control and system identification on iEi Puzzle series ARM-based appliances.
> > + *
> > + * Copyright (C) 2020 Sartura Ltd.
> > + * Author: Luka Kovacic <luka.kovacic@...tura.hr>
> > + */
> > +
> > +#ifndef _MFD_IEI_WT61P803_PUZZLE_H_
> > +#define _MFD_IEI_WT61P803_PUZZLE_H_
> > +
> > +#define IEI_WT61P803_PUZZLE_BUF_SIZE 512
> > +
> > +/* Command magic numbers */
> > +#define IEI_WT61P803_PUZZLE_CMD_HEADER_START 0x40 /* @ */
> > +#define IEI_WT61P803_PUZZLE_CMD_HEADER_START_OTHER 0x25 /* % */
> > +#define IEI_WT61P803_PUZZLE_CMD_HEADER_EEPROM 0xF7
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_RESPONSE_OK 0x30 /* 0 */
> > +#define IEI_WT61P803_PUZZLE_CHECKSUM_RESPONSE_OK 0x70
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_EEPROM_READ 0xA1
> > +#define IEI_WT61P803_PUZZLE_CMD_EEPROM_WRITE 0xA0
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_VERSION 0x56 /* V */
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_BUILD 0x42 /* B */
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_BOOTLOADER_MODE 0x4D /* M */
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_BOOTLOADER 0x30
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_MODE_APPS 0x31
> > +#define IEI_WT61P803_PUZZLE_CMD_OTHER_PROTOCOL_VERSION 0x50 /* P */
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_SINGLE 0x43 /* C */
> > +#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER 0x4F /* O */
> > +#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_STATUS 0x53 /* S */
> > +#define IEI_WT61P803_PUZZLE_CMD_FUNCTION_OTHER_POWER_LOSS 0x41 /* A */
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_LED 0x52 /* R */
> > +#define IEI_WT61P803_PUZZLE_CMD_LED_POWER 0x31 /* 1 */
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_TEMP 0x54 /* T */
> > +#define IEI_WT61P803_PUZZLE_CMD_TEMP_ALL 0x41 /* A */
> > +
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN 0x46 /* F */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_0 0x30
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_1 0x31
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_READ 0x5A /* Z */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_PWM_WRITE 0x57 /* W */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_0 0x41 /* A */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_1 0x42 /* B */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_2 0x43 /* C */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_3 0x44 /* D */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_4 0x45 /* E */
> > +#define IEI_WT61P803_PUZZLE_CMD_FAN_RPM_5 0x46 /* F */
> > +
> > +struct iei_wt61p803_puzzle_mcu_version;
> > +struct iei_wt61p803_puzzle_reply;
> > +struct iei_wt61p803_puzzle;
> > +
> > +int iei_wt61p803_puzzle_write_command_watchdog(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char *cmd, size_t size,
> > + unsigned char *reply_data, size_t *reply_size,
> > + int retry_count);
> > +
> > +int iei_wt61p803_puzzle_write_command(struct iei_wt61p803_puzzle *mcu,
> > + unsigned char *cmd, size_t size,
> > + unsigned char *reply_data, size_t *reply_size);
> > +
> > +#endif /* _MFD_IEI_WT61P803_PUZZLE_H_ */
>
> Marek
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